Carburetor



Dec. 5, 1933. 4 o. MElssNl-:R 1,938,298

CARBURETOR Filed NOV. 15, 1930 Patented Dec. 5, 1933 UNlD STATESCARBURETOR Otto Meissner,

Berlin, Germany Application November 13, 1930, Serial No. 495,452,

and in Germany 3 Claims.

The invention relates to carburetors for internal combustion engines,and more particularly to a spray carburetor with a fuel check andregulating valve or a fuel check or regulating 5 valve directlycontrolled by the suction stroke of the engine or other suitable meansand having a by-pass channel opening at the edge of the throttle member.

One object of the invention is to provide adjustable stops or abutmentsfor controlling the fuel check and regulating member or the fuel checkor regulating member when the engine runs light as well as during thetransition and during the maximum output or full load.

Another object of the invention is to design the individual stops insuch a way that each of them may be adjusted during the working of theengine without the other stops and the members cooperating with thembeing affected thereby.

A further object of the invention is to provide a stop adapted to becontrolled by hand or by the throttle member which acts upon theprojecting end of the fuel check and/or regulating member and which isadjustable for the purpose of regulating the 11o-load run of theengine.V

A further object of the invention is to provide a lever in connectionwith the stop for controlling the fuel check and regulating member whichlever is adapted to be controlled by a stopconnected with the spindle ofthe throttle member which is adjustable for the purpose of effecting thetransition regulation without the no-load position being affected.

A further object of the invention is to make 35 provisions for the fuelquantity regulation for the maximum output taking place by an adjustablestop or the like without the 11o-load and transition adjustment beingaffected thereby.

A still further object of the invention is to 40 provide apart from themember controlled by the suction stroke of the engine, which in thiscase acts merely as check member, a second con-- trollable andadjustable check and regulating member or regulating member only betweenthe f first member and the fuel pipe.

A further novel feature of the invention is that the fuel check andregulating member is, for instance, raised by a spring and forced downupon its seat by an adjustable stop acting upon it and adapted to becontrolled by hand or by the throttle member.

Another novel feature of the invention is that the no-load regulationtakes place by adjusting the needle valve in relation to its seat orvice versa, and that the lever acting upon the ad- November 14,1929

justable stop of the fuel check and regulating member or fuel check orregulating member is adapted to be rendered operative not only by' handor by the throttle member but also by a starting device without theindividual control gears affecting one another.

A still further feature of the invention is that when the mixture issupplied by the starting mechanism alone or in conjunction with thethrottle member a larger quantity of fuel-air mixture and a mixturestronger in fuel is fed to the engine and that the additional quantityof fuel is adapted to be regulated by an adjustable stop.

On the drawing aflixed to my specication and forming part thereof someembodiments of the invention-are illustrated by wayof example.

The invention is illustrated in 'the accompanying drawing in which:

Fig. 1 shows the improved carburetor in sectional elevation, with theYcheck and regulating valve and the stop controlled by the throttlemember or by hand,

Fig. 1a is a diagrammatic plan View of the carburetor shown in Fig. 1.

Fig. 2 is a further embodiment of the invention in vertical section, inwhich a special check and regulating valve is provided in addition tothe fuel valve,

Fig. 3 is a third embodiment of the invention, in which the stop for thefuel valve is coupled with a starting device, and

Fig. 4 is a still further embodiment in which the starting device alsocontrols the throttle member.

Referring to Fig. 1 of the drawing, 1 is the casing of the carburetorwith the removable nozzle pillar or shank 2. In this pillar isaccommodated the fuel check and regulating valve 3 with the disc orplate 4 and needle 5. in the inoperative state the conical end 6 of thevalve 3 rests upon the conical seat '7 of the nozzle pillar or shank 2and the needle 5 projects into the bore 8. The valve 3 passes with itsupper end 9 through the check or cap nut 10. Above the end 9 of thevalve there is according to the invention provided a stop or abutment 1lwhich is adapted to be adjusted within its guide 12, for the purpose ofadjusting the running light of the engine. The stop 11 and the lever 13connected with it are pivotally mounted at an extension of thecarburetor casing and are maintained in their inoperative position by aspring or by gravity.

On the spindle of the throttle 14 there is provided a stop 15 which islikewiselongitudinally adjustable, to enable adjustment to be madebetween lever 13 and the throttle 14. Into the cap nut 10 there is inthe case illustrated screwed a screw 16 which serves as stop or abutmentfor the collar 17 or the like of the valve spindle 3 so. that themaximum output may be regulated by adjusting the screw 16. The maximumoutput could naturally also be adjusted by means of the Calibratingnozzle 35.

In the embodiment illustrated in Fig. 2 of the drawing there is inaddition to the valve 3 controlled byV the suction stroke of the enginealso provided between this valve and the fuel supply pipe 18 a specialcheck and regulating valve 19 with needle point 20 which is raised, forinstance, by a spring 21 when the stop 11 is moved out of the way. Thecollar 23 resting in the inoperative state upon the seat 22 serves atthe same time as stop for the maximum output of the engine when it comesin contact with the adjustable screw 16. Between the seating 22 and thefuel pipe 24, there are provided packings 25 which preferably standunder the action of springs. The running light regulation is in thiscase effected by the screw 26 which adjusts the fuel channel 27 inrelation to the needle 20.

In Fig. k3 of the drawing there is illustrated an embodiment ofa'combination of the fuel valve 3, not shown in this figure, with astarting is increased so that an ample quantity of fuelV can pass intothe mixing chamber 31. When the valve 30 is opened the passage to achannel is uncovered which opens between throttle member 14 and thecylinder of the engine so that a suflicient and adequately saturatedquantity of fuel-air mixture is sucked into the engine. During themotion of the valve 30 the pin 32 comes in contact with the adjustablenut 33 whereby the stroke of the lever 13 and the valve 3 or 19 islimited. If the stop 11, 13 is operated by the movement of the throttlemember 14 or by hand, the pin 28 has no effect on the starting device30. The lever 29 for imparting motion to the throttle member 14 may, asshown in Fig. 4, likewise be moved by a pin 31 of the starting device30, so that when the starting device is opened the throttle member islikewise opened. In this case also provisions have been made for movingthe throttle mechanism independently ofthe starting device. In all casesthe stop 11 may be positively operated by hand by means of a Bowden wireor the like so that the quantity of fuel may also be regulated by hand.

I claim as my invention:

1. In a spray carburetor for internal combustion engines, a fuel checkand regulating valve controlled by the suction stroke of the engineacting as a check member, a second check and regulating member locatedbetween said rst control member and a fuel supply pipe, a spring forraising said second member, and an adjustable stop controlled by thethrottling member for pressing said second member against its seat.

2. In a spray carburetor for internal combustion engines, a fuel checkand regulating valve controlled by the suction stroke of the engineacting as a check member, an adjustable stop for regulating the quantityof fuel for the full capacity of the engine without the running lightand transition period being affected, a second check and regulatingmember located between the first control member and a fuel supply pipe,and means for selectively effecting the running light regulationmanually.

3. In a spray carburetor for internal combustion engines, a fuel checkand regulating valve directly controlled by thesuction stroke of theengine, a stop for said fuel check, a lever adjustably supporting saidstop, a throttling member for the engine, and a second stop adjustablyconnected with the throttling member to cooperate with said lever tocontrol the fuel check without the light running position of the enginebeing affected.

OTTO MEISSNER.

